BMW 3: Climate Control
BMW 3 Series G20 (2018-2026) Training manual / Climate Control
As in previous BMW hybrid vehicles, an electrically powered air conditioning compressor is used in the G20 PHEV. Because the A/C compressor has an electric motor, it is possible to operate the air conditioning independently of the combustion engine. Thus the customer can enjoy the cooling effect of the air conditioning even while driving in pure electric mode and while stopped.
The high-voltage battery unit is cooled by the vehicle's refrigerant's circuit.
The stationary climate control is also available in the G20 PHEV.
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System overview
G20 PHEV, components of refrigerant circuit
Combined expansion and shutoff valve (interior)
Combined expansion and shutoff valve (high-voltage battery unit)
High-voltage battery unit
Refrig
Electric A/C compressor
Electric A/C compressor (EKK)
Signal connector
Low pressure line (gaseous refrigerant at low temperature and low
pressure)
High-voltage connector
High pressure line (gaseous refrigerant at hig
Stationary cooling
Owing to the fact that the air conditioning compressor in the G20 PHEV is
electrically operated and
that the high-voltage battery unit has high energy and power densities, a
stationary climate
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Drive-ready state
Switching on drive-ready state
Depress the brake pedal.
Press the Start/Stop button.
Switching off drive-ready state
Steptronic transmission:
1. Engage selector lever position P with the vehicle
stopped.
2. Press the Start/Stop button.
The engine is switched off.
3. Set the parking brake.
Aut
Monitoring functions
High-voltage interlock loop
The SME control unit evaluates the signal of the high-voltage interlock loop
and checks whether there
is an open circuit with this circuit. In the event of an open circuit, the
battery management electronics
control unit can cause the high-voltage system to perform a qu
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